Adjustable internal expansion grinder



June 6, 1950 s. R. KELLER 2,

ADJUSTABLE INTERNAL EXPANSION-GRINDER Filed Aug. 7, 1947 2 Sheets-Sheet 1 I N VEN TOR.

ATTD RN EYE 2 Sheets-Sheet 2 S. R. KELLER ADJUSTABLE INTERNAL EXPANSION GRINDER June 6, 1950 Filed Aug. 7, 1947 INVENTOR. SpeWc erH/Ye/Yer Patented June 6, 1950 OFFICE ADJUSTABLE INTERNALVEXPANSION GRINDER Spencer R. Keller, Handley, W. Va.

Application August 7, 1947, Serial No. 767,005

4 Claims; (Cl. 51184;2)

This invention relates to internal grinding tools. v

It is an object of the present'invention to provide an internal grinding tool adapted for grinding the walls of cylinders or bearing surfaces which is adjustable to different diameters of the openings and wherein the grinding stones are retained against the surface being ground by the joint effect of a spring device and of centrifugal action.

Other objects of the present invention are to provide an adjustable grinder adapted for use in openings, which is of simple construction, inexpensive to manufacture, sturdy and durable, easy to adjust and efficient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 isa side elevational view of my internal grinding tool. I

Fig. 2 is'an end elevational view of the tool lookin; upon the front 'of the stones.

Fig. 3 is an end elevational view of my grinding tool looking upon the spindle end of the same.

Fig. 4 is a longitudinal cross-sectional view taken on line 4-4 of Fig. 1. T

Fig. 5 is an enlarged fragmentary and. crosssectional view with the grinding stones expanded to accommodate the larger diameters.

Figs. 6 and 7 are respectively transverse crosssectional views taken respectively on lines 66 and 'I'I of Fig. 4.

Referring now to the figures, I represents a spindle adapted to fit a chuck. This spindle has an extension II with threads I2 thereon and a shoulder I3 against which there can be fitted a sleeve I4. This sleeve has a threaded portion I in which is a pin I6 extending across the opening thereof. The opening in this portion I5 is flared or tapered as shown at I! to permit the outward pivotal movement of members I8 and I9 carrying respectively stone pieces 2| and 22. Extending beyond the threaded portion I5 of the sleeve are extensions 23 and 24 which serve to guide and confine the members I8 and I9 as they are separated or brought together. Between the ends of these extensions 23 and 24 there is extended a pin 25 which will serve to limit the inward movements of the members I8 and. I9 and cause them to be kept centered. The holes in the members I8 and I9 are larger than the diameter of the pin I6 whereby to provide a loose fit and permit the members to pivot. The inner ends of the members I8 and I9 are relieved as indicated at 26 to permit the members to be pivoted outwardly with-- out interference. The outer ends of the members I8 and I9 are flared or tapered as indicated 'atJZ'I and are adapted to be engaged by the outer ends of an adjusting sleeve 28 which is adjustable'along the threaded portion I5 of the sleeve I4. When, the adjustment has been effected, a set screw 29 is expansion of the members I8 and I9 is permitted as shown in Fig. 5 whereby to permit larger openings' to be ground.

The stone parts 2| and 22 are of 'halfcircular shape and have holes in the same'for the attachment of the grinding stones over projections'3l' disposed respectively on the ends of the members I8 and I9. Retaining or clamping plates 32 and 33 with flanges 34 are disposed on the projections 3|. The flanges 34 extending over the straight surfaces of the stoneparts 2| and 22 longitudi nally thereof prevent theparts from rotation on the projections independently thereof.- Also disposed on the projections 31 are spring retaining elements 35 and 36 having respectively ho1es 31 for receiving a spring; These retaining elements 35 have flange portions 39'for receiving th projections. Tightening nuts AI are disposed on the projections 31 to' retain the parts tightly upon the respective members I8 and I9. The spring 38 Will'tend to divide the members and'hold. them apart so that the inclined faces of the members I8 and I9 are maintained in engagement with the end of the sleeve 28.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

I claim:

1. An adjustable internal grinding tool comprising spindle means having a hollow threaded portion thereon, a. pair of guide extensions extending from the threaded portion to serve as guides, an adjusting sleeve on the threaded portion, separable members connected to the threaded portion inwardly thereof for pivotal movement with respect thereto :and extending outwardly between the guide extensions whereby to be guided in their pivotal movement as they are separated from one another, grinding stone elements disposed respectively on each of said separable members, said separable members having inclined edges adapted to be engaged by the end of the adjusting sleeve inwardly thereof, and spring means extending between said members to threaded portion, inwardly thereof for pivotal movement with respect thereto and extending outwardly between the guide extensions whereby to be guided in their pivotal movement as they are separated from one another, grinding stone.- elements disposed respectively on each of said separable members, said separable members having inclined edges adapted to be engaged by the end of the adjusting sleeve inwardlythereof, and spring means extending between said members to:

force the inclined edges against the end of the sleeve whereby to retain the stone elements in their separated or. adjusted positions, said'spring; meanscomprising spring retaining elements with openings therein for receiving the ends of a, coil spring.,said stone retaining members comprising projections extending through the stone elements, saidspringretaining elements being disposedon the projections at their outer ends and lock devices disposed respectively on the projections to fix the spring retainingmembers and'the stones to the respectiv stone carrying members.

3; An adjustable internal grinding tool comprising spindle means having.ahollowthreaded' portionthereon, a pair of guide extensions extending from the threaded, portion to serve as guides, an adjusting sleeve on the threaded portion, separable membersv connected to the threaded portion inwardly thereof for pivotal movement with respectthereto and extending outwardly between the guide extensions whereby to be guided in their pivotal'movement as, they are separated from one another, grinding stone elements disposed respectively on each of said separable'members, said separable members having inclined edges adapted to be engaged by the end'oftheadjusting sleeve inwardly thereof, and spring-means extending between said members to force the inclined edges against the end of the sleeve whereby'to retain' the stone elementsin' their separated oradjusted. positions, and a pin extending between the outer ends of the extensions serving to limit the inward movement of the members which carry the ston elements and whereby to keep said members centered within the adjusting sleeve and upon their pivot connections.

4. An adjustable internal grinding tool comprising spindle means having a threaded portionthereon, an,- extension extending from the threaded portion; to serve as, guides, an adjusting sleeve on the threaded portion, separable members connected to the threaded portion for pivotal movement with respect thereto and extending outwardly between the guide extensions whereby to be guided in their pivotal movement as they are separated from one another, grinding stone elements disposed respectively on each ofsaid-separable-members, said separable members having inclined edges adapted to be engaged by the end of the adjusting sleeve, and spring meansextending between said members to force th inclined edges against the end of the sleeve,

whereby to retain. the stone elements in their separated or adjusted positions, said members having projections for receiving the stone elements, clamping plates adapted to be extended over the projections and having lips extending along their bottom edges to fit flush with the sides of the stone" elements whereby to keep the stones from turning on the projections when the clamping plates and th stone are tightened thereupon;

SPENCER R. KELLER.

REFERENCES CITED" The following references are of record in the file of this patent:

UNITEDL STATES, PATENTS Number Name Date 38,153 Cowing Apr; 14, 1863 71,471 Eggleston Nov; 26, 1867' 1,198,884 Emery Aug; 8, 1916 2,212,159 Hingle' Aug; 20, 1910' 2,455,065 Keller Nov. 30', 1948 FOREIGN PATENTS Number Country Date 3684580: Italy: Feb; 18, 1939 

